[ awr-nuh-theen ]
/ ˈɔr nəˌθin /
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an amino acid, H2N(CH2)3CH(NH2)COOH, obtained by the hydrolysis of arginine and occurring as an intermediate compound in the urea cycle of mammals.
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Origin of ornithine
1880–85; ornith(uric acid), secreted by birds + -ine2
Words nearby ornithine
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
British Dictionary definitions for ornithine
/ (ˈɔːnɪˌθiːn) /
an amino acid produced from arginine by hydrolysis: involved in the formation of urea in the liver; diaminopentanoic acid. Formula: NH 2 (CH 2) 3 CHNH 2 COOH
Word Origin for ornithine
C19: from ornithuric (acid) secreted in the urine of birds, from ornitho- + uric
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Medical definitions for ornithine
[ ôr′nə-thēn′ ]
An amino acid formed by the hydrolysis of arginine and important in the formation of urea.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Scientific definitions for ornithine
[ ôr′nə-thēn′ ]
An amino acid not found in proteins, formed by hydrolyzing arginine and important in the formation of urea. Chemical formula: C5H12N2O2.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.